大发快大小单双计划简介：Assume that after x years, its value drops to 100,000 yuan, then, after 19 years, the value of the machine drops to 100,000 yuan. Su Can calculated it silently in his mind and came up with the final answer, then explained it aloud.
Assume that after x years, its value drops to 100,000 yuan, then, after 19 years, the value of the machine drops to 100,000 yuan. Su Can calculated it silently in his mind and came up with the final answer, then explained it aloud.
